Hi,
Rollback or reinstall version 3.8.1. It works!
Hello ! Same for me. I’m also using Divi, but I think that’s not the problem, because it works fine on an other website whit Divi. I guess it depends on the used version: the one which works 3.8.1, the one which sucks 3.8.6. I hope it will be fixed on the next update…
I’ve got the same problem this morning: no membership function working, and the main menu disappeard. Luckily, I had saved the DB and the file before upgrading !